Improvement in scroll-sawing machines



GEORGE COOK. Improvement in Scroll-Sawing Machines. No. 114,768.

Patented May 16, 187i.

Xxx wanna" GEORGE OOOKE, OF NAPIER, CANADA.

Letters Patent No. 114,768, dated May 16, 1871.

A I IMPROVEMENT lN SCROLL-SAWING MACHINES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom 'it may concern.-

Be it known that I, GEORGE OOOKE, of Napier, in the county of Middlesex and Dominion of Canada, have invented a new and useful Improvementin Scroll- Sawing Machines; and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon and being a part of this specification, in which my invention is shown in perspective.

The nature of this invention relates to an improved method of constructing scroll-sawin g machines sothat the saw may always be kept at a suitable tensionthat is, provided with a small air-pump for the purpose of clearing away the sawdust-and wherein the upper end of the saw may be readily detached, when desired, and employed in fret-work, so-callcd.

The invention consists in securing to the upper and lower cross-heads, to which the saw is attached, abelt which passes over a combination of three pulleys, and so arranged that with each upward and downward reciprocation ofthe saw the pulleys have a semi-rota-- tion backward and forward, carrying the belt with them, and thereby keeping the same tension on the saw at all times; also, in attaching to one of said pulleys a small air-pump forthe purpose of blowing away the dust which accumulates in the use of the saw; also, in the new and ingenious method of so securing the upper end of the saw to its cross-head that it may readily be detached, when desired; also, in the novel arrangement and combination of the various parts to form a perfect machine for-the purpose, and as more fully hereinafter"described.

1n the accompanying thawing- A represents a suitable frame, to which is secured the operating parts of the machine, and which is surmounted by the usual table 15, through which the saw has a reciprocating movement.

G is a balance-wheel secured to a driving-shaft, to which motion is given by any suitable power.

To a'crank-pin, D, is attached the pitman E, the upper end of which is pivoted to the lower cross-head F, which works upon a slide, G.

The lower end of the saw H is secured to this crosshead.

Another cross-head, I, works upon a similar slide, J, and to this cross-head is secured the upper end of the saw by'means of a hole drilled in said upper end of the saw, which engages with a wrist-pin, a, rigidly.

secured to the cross-head I.

Pulleys K L M are arranged relatively to each other, as shown, K being directly below the lower cross-head, M being directly above the upper crosshead, and both cross-heads and pulleys K Mallbeing in line. The pulley L is situated in line with K M and at some distance in the rear, and may be secured, as shown, to a prolongation in the rear of the frame, or to a post, or any other suitable place.

A belt, 0, is attached at one end to the lower crosshead, and thence is led downward around the pulley K, thence upward and around pulley L, and thence over pulley M downward, and the opposite end secured to the upper cross-head.

To the pulley" M, by means of a crank-pin, b, is attached a connecting-rod, c, the other end of which is secured to a piston working in the air-pump N, to the lower end of which is secured the funnel-shaped pipe (I, by means of which, with each reciprocation of the piston, a current of air is forced to the top of the table to, blow off the sawdust.

WhatI claim as my invention, and desire to secure by Letters Patent, is

The combination of the frame A, table B, balancewhecl O, crank-pin I), pitman E, cross-heads 1* I, slides G J, saw H, pulleys K L M, air-pum p N, crankpin 1), rod 0, and belt 0, constructed and operating substantially as described and shown, for the purposes set forth.

GEORGE OOOKE. Witnesses:

Tnos. S. SPRAGUE, MARTHA STEWART. 

